Weaver Top Mount Scope Base #410 Aluminum base;Machined to tight tolerances;Compatible with Thompson Center Encore, Omega, and Impact;Available in sizes: #12, #14, #16, #19, #24, #35, #35M, #36, #36M, #402M, #40A, #410, #411, #413T, #417M, #418M, #46M, #55, #61, #61M, #62, #63B, #70, #82, #90, #93, # 95, #97, #TO-09table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 4000 Product Group Code: 4000C Product Sub Group 1: 4000C2 Inactive: No